Final answer:
It is true that many Late Triassic dinosaurs are known primarily from isolated teeth and bones, reflecting the challenges in fossil preservation and discovery over such a vast timespan. Fragmentary fossils from this era have been pivotal in studying the early evolution and diversity of dinosaurs.
Step-by-step explanation:
The Triassic Period marked the emergence of dinosaurs, and it is true that many Late Triassic dinosaurs are only known from isolated teeth and bones. This scarcity of complete fossils is partly due to the passage of time and natural processes that have either destroyed or yet to reveal entire skeletons.
The discovery of a variety of dinosaur teeth and isolated bones does provide evidence of their existence during this period. However, given the vastness of time, many fossils have not been preserved or discovered. The Late Triassic era was a crucial time for the evolution of dinosaurs, which later flourished in the Jurassic Period. Fragmentary fossils including Herrerasaurus and Eoraptor, some of the earliest known dinosaurs, have also helped scientists to unravel the story of dinosaur evolution.
The advancements in our understanding of this era are greatly due to these findings and continue to offer insight as more discoveries are made by paleontologists. Despite the challenges of piecing together life from incomplete records, the segmented knowledge we do possess about Triassic dinosaurs has been critical in understanding their rise and dominance.